Leases (Components Of Lease Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Leases [Abstract]
Operating lease expense	$ 1,519	$ 1,478
Finance lease expense:
Amortization of right-of-use assets	40	32
Interest on lease liabilities	4	3
Total finance lease expense	44	35
Short-term lease expense	75	138
Variable lease expense	$ 759	$ 681